Datasheet

MCP2003/4/3A/4A
DS20002230E-page 6  2010-2013 Microchip Technology Inc.
FIGURE 1-5: OPERATIONAL MODES STATE DIAGRAM – MCP2004A
TABLE 1-1: OVERVIEW OF OPERATIONAL MODES
State Transmitter Receiver Vren Operation Comments
POR OFF OFF OFF Check CS, if low then Ready;
If high transitions to either T
OFF or Operation
mode, depending on T
XD (2003/A), or TXD
and FAULT/TXE (2004/A).
V
BB > VBB(MIN)
and Internal
Supply stable
Ready OFF ON ON If CS high level, then either Operation or
T
XOFF mode.
Bus Off state
Operation ON ON ON If CS low level, then Power-Down;
If FAULT
/TXE low level, then Transmitter Off
mode.
Normal Operation
mode
Power-Down OFF Activity
Detect
OFF On CS high level, go to READY then either
Operation mode or T
XOFF.
MCP2003/2003A: Falling edge on WAKE will
put the device into READY mode.
MCP2003/MCP2004: falling edge on LIN bus
will put the device into READY mode.
MCP2003A/MCP2004A: rising edge on LIN
bus will put the device into READY mode.
Low Power mode
Transmitter Off OFF ON ON If CS low level, then Power-Down;
If FAULT
/TXE and TXD high, then Operation
mode
FAULT
/TXE only
available on
MCP2004/2004A
POR
VREN OFF
RX OFF
TX OFF
VBAT>5.5V
Ready
VREN ON
RX ON
TX OFF
TOFF
Mode
VREN ON
RX ON
TX OFF
Operation
Mode
VREN ON
RX ON
TX ON
POWER
DOWN
VREN OFF
RX OFF
TX OFF
CS=1 & (TXE=0 or TXD=0)
CS=1 & TXD=1 & TXE=1
CS=1 & TXD=1 &TXE=1 &
No Fault
Fault (thermal or timeout)
or FAULT/TXE=0
CS=0
Rising edge on LIN
or CS=1
CS=0